/*
 * Copyright 2003,2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.cglib.proxy;

import java.util.*;

import com.cglib.core.*;
import com.objectweb.asm.Type;

class DispatcherGenerator implements CallbackGenerator {
	public static final DispatcherGenerator INSTANCE = new DispatcherGenerator(false);
	public static final DispatcherGenerator PROXY_REF_INSTANCE = new DispatcherGenerator(true);

	private static final Type DISPATCHER = TypeUtils.parseType(TypeName.cglib_proxy_Dispatcher);
	private static final Type PROXY_REF_DISPATCHER = TypeUtils.parseType(TypeName.cglib_proxy_ProxyRefDispatcher);
	private static final Signature LOAD_OBJECT = TypeUtils.parseSignature("Object loadObject()");
	private static final Signature PROXY_REF_LOAD_OBJECT = TypeUtils.parseSignature("Object loadObject(Object)");

	private boolean proxyRef;

	private DispatcherGenerator(boolean proxyRef) {
		this.proxyRef = proxyRef;
	}

	public void generate(ClassEmitter ce, Context context, List methods) {
		for (Iterator it = methods.iterator(); it.hasNext();) {
			MethodInfo method = (MethodInfo) it.next();
			if (!TypeUtils.isProtected(method.getModifiers())) {
				CodeEmitter e = context.beginMethod(ce, method);
				context.emitCallback(e, context.getIndex(method));
				if (proxyRef) {
					e.load_this();
					e.invoke_interface(PROXY_REF_DISPATCHER, PROXY_REF_LOAD_OBJECT);
				} else {
					e.invoke_interface(DISPATCHER, LOAD_OBJECT);
				}
				e.checkcast(method.getClassInfo().getType());
				e.load_args();
				e.invoke(method);
				e.return_value();
				e.end_method();
			}
		}
	}

	public void generateStatic(CodeEmitter e, Context context, List methods) {
	}
}
